Monochrome toolbar icons - why?

After a recent update to inkscape (to 0.92), on my Ubuntu machine (18.04), the toolbar icons all went monochrome The icons.svg file in the .config/inkscape/icons folder has color icons in it. I have replaced the icons.svg with assorted different icon sets, both in the config file in my home folder, and in /usr/share/inkscape. but my toolbars are still monochrome.

How do I get some color back into my Inkscape

Interestingly - same version on Inkscape on windows has colorful toolbars. And before you ask, I took the icons.svg from the windows install and put in the config folders on the Ubuntu machine. The toolbars remained stubbornly grey.

Related bugs

Related FAQ:

It's a problem with Ubuntu devs (previously, I thought it was Linux Mint, but I was wrong) thinking everyone wants their icons for Inkscape, so everything looks nicely uniform. They did not take into account that people may want to choose their own style.

The only way to fix this is to use a different theme for your desktop icons, in the Ubuntu settings.

I'm all for clean looking uncluttered UI's, but Inkscape has a lot of features so there are a lot of items in the toolbars, and making all the toolbars grey so they look like they're disabled doesn't seem to be a good way to improve usability. or aesthetics.

Oh well, what better way to spend Saturday evening, than tinkering with Ubuntu themes.

Using gnome-tweaks in the appearance tab, I changed the icons from "POP" (I'm using POP-OS) to "LoginIcons". Now the toolbars on everything are back to being colorful with associated improvement in ease of use.

Still curious to understand why it was decided that making everything gray would improve the usability.